北師大版高中英語模塊7--Unit 20 lessons3-3

[00:01.70]A few years later, penicillin was being mass- [00:04.38]produced and helping to save the lives [00:06.82]of millions. [00:08.31]Despite the incredible outcome of his discovery [00:11.08]Fleming remained modest. [00:13.06]"Nature makes penicillin," he said, [00:15.34]" I just found it." [00:17.57]During the Second World War, [00:19.26]when penicillin was first being used, [00:21.48]the US Navy wre looking for ways [00:23.19]of improving the accuracy of their missiles, [00:25.98]but this was very complex. [00:28.17]The navy turned to Eckert, [00:30.38]an engineer, and Mauchly, a physicist, [00:33.54]to produce a machine to do the job. [00:36.08]Although they and their team did not finish [00:38.21]the machine until after the war, [00:40.42]in February 1946, it did not matter. [00:43.49]This huge machine [00:45.35]was the world's first computer. [00:47.51]But it was nothing like our computers today. [00:50.27]It measured 100 feet long by over 10 feet high [00:53.57]and weighed over 30 tonnes. [00:56.02]And with 18,000 tubes and 6,000 switches, [00:59.49]it used so much energy [01:01.14]that when it was turned on, [01:02.83]the lights in the local town went out! [01:04.43]

00:00

00:00

MP3下載 文本下載